[Catalog-sig] simple package index has links back into the human interface

["Martin v. Löwis"]

> Martin, how safe would it be for me to make the next version of
> setuptools begin using the "simple" index?  I mean, is it an official
> API now?

It's an official API, and I'd encourage using it. Of course, it may have
bugs, but I'll try to get them fixed when I find the time to do so.

Regards,
Martin